function show_menu(c){
  var flag = 0;
  flag = 0;
  c.style.display = "";
 }
 
 
 function hide_menu(c){ 
  c.style.display = "none";
 }
 
function openContact(){
  	popupWin = window.open("contact_us.htm","contact","left=200,top=100,width=400,height=400");
	popupWin.focus()	
  }